<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>主页</title>
    <style>
ul {
  list-style-type: none;
  margin: 0;
  padding: 0;
  overflow: hidden;
  background-color: #333;
}

li {
  float: left;
}

li a {
  display: block;
  color: white;
  text-align: center;
  padding: 14px 16px;
  text-decoration: none;
}

li a:hover:not(.active) {
  background-color: #111;
}

.active {
  background-color: #9999ff;
}
li {
  border-right: 1px solid #bbb;
}

li:last-child {
  border-right: none;
}
ul {
  position: fixed;
  top: 0;
  width: 100%;
}
.header {
  padding: 20px;
  text-align: center;
}
/* 创建并排的三个非等列 */
.column {
  float: left;
  width: 33.33%;
  padding: 15px;
}

/* 清除列之后的浮动 */
.row:after {
  content: "";
  display: table;
  clear: both;
}

/* 响应式布局 - 创建堆叠而非并排的三列 */
@media screen and (max-width:600px) {
  .column {
    width: 100%;
  }
}
#d1{
				width: 100px;
				height: 100px;
				border: 1px solid black;
				border-radius: 50%;
				overflow: hidden;
				margin:75px 200px 20px 800px
			}
			img {
				max-height: 100%;

</style>
</head>
<body background="主页背景.jpg";
      style="
background-repeat:no-repeat;
background-size:100% ">
<ul>
  <li><a class="active" href="#">主页</a></li>
  <li><a href="对计算机专业的认识.html">对计算机专业的认识</a></li>
  <li><a href="计算机各课程关系.html">计算机各课程关系</a></li>
  <li><a href="未来学业规划.html">未来学业规划</a></li>
  <li><a href="计算机各课程资料.html">计算机各课程资料</a></li>
</ul>
<div id="d1"><img src="校标.jpg"></div>
<h1 align="center" style="text-decoration:underline;color:#c0c0c0">精勤求学，敦笃励志</h1>
<h1 align="center" style="text-decoration:underline;color:#c0c0c0">果毅力行，忠恕任事</h1>
<p style="text-align:center"><img src="主页展示中间块.jpg" style=""></p>
</body>
</html>